Many state permits adopt EPA's industrial stormwater benchmark monitoring values. The following are examples for Sector J (Mineral Mining and Dressing) by state:
- Indiana (ISGP): Nitrate + Nitrite-N (0.68 mg/L), Zinc (0.117 mg/L), Lead (0.0816 mg/L)
- Ohio: Iron (1.0 mg/L), Nitrate-N (0.68 mg/L)
- Illinois: Nitrate-N (0.68 mg/L)
- Kentucky: Iron (1.0 mg/L), Zinc (0.117 mg/L)
- Michigan: Nitrate-N (0.68 mg/L), Iron (1.0 mg/L), Total Phosphorus (2.0 mg/L)
- Missouri: Nitrate-N (0.68 mg/L), Zinc (0.117 mg/L), Lead (0.0816 mg/L)
- Pennsylvania: Iron (1.0 mg/L), Aluminum (0.75 mg/L)
- West Virginia: Nitrate-N (0.68 mg/L), Zinc (0.117 mg/L)
- Texas: Iron (1.0 mg/L), Aluminum (0.75 mg/L), Nitrate-N (0.68 mg/L)
Values may differ for other sectors (e.g., A, C, D, E, N) depending on the permit. Always consult your site’s specific authorization letter or general permit language.